HEVC to FLV Converter

HEVC to FLV Converter

A bare .hevc file is a raw H.265 video bitstream — the unwrapped compressed stream an encoder writes out, with no container and no audio track — and FLV is Adobe's Flash Video format, which has been effectively dead since Flash Player reached end of life. This converter does the job, but two things are worth knowing first: the FLV will be silent (there is no sound inside a .hevc to carry over), and FLV's default codec is generations older than H.265, so the picture gets worse and the file usually grows. The tables below explain both formats so you can decide whether FLV is really what you need.

HEVC (Source) Format at a Glance

FLV (Output) Format at a Glance

How to Convert HEVC to FLV

1. Upload Your HEVC File: Drag and drop your .hevc file onto the page or click "+ Add Files" to browse. You can queue several raw H.265 streams and process them with the same settings.
2. Pick a Quality Preset: Open Advanced Options. Under "File Compression" keep "Quality Preset" with "Preset" on "Very High (Recommended)" for the closest result, or choose "Specific file size" to cap the output in MB — useful because the older FLV codec is larger than H.265 at matched quality.
3. Set Resolution and Trim (Optional): Use "Video resolution" to downscale, and under "Show All Options" the "Video Codec" defaults to FLV (Sorenson Spark). Use the "Trim" section's "Time Range" to export only the segment you need.
4. Convert and Download: Click "Convert" and download your FLV. No sign-up, no watermark.

Frequently Asked Questions

Why is my HEVC to FLV output silent?

Because a raw .hevc file is an H.265 video elementary stream and holds no audio. HEVC, defined by ITU-T H.265 / ISO/IEC 23008-2, is a video-only codec, so there is no soundtrack inside the file to convert and any FLV produced from a bare .hevc is silent. The audio you remember almost certainly lived in a container — an .mp4, .mkv, or .mov — that wrapped the H.265 video next to a separate audio track, and that audio was left behind when the file was exported down to a raw stream. If you need the sound, convert that original container instead, for example with MP4 to FLV or MKV to FLV.

Is converting HEVC to FLV a lossless rewrap or a re-encode?

A re-encode. FLV does not carry the H.265 codec, so there is no way to keep your original stream and simply put it in a .flv. The converter decodes the H.265 frames and re-encodes them to the FLV codec (FLV1 / Sorenson Spark by default), which means a second lossy pass. No setting recovers detail — the best you can do is keep the "Preset" high so the loss stays small. If you want a container that can hold the H.265 stream without re-encoding, HEVC to MP4 keeps the codec intact; FLV cannot.

Which codec does the FLV output use, and why is the file larger than my HEVC?

By default it uses FLV1, also called Sorenson Spark — an H.263-derived codec from the early 2000s. It is generations behind H.265, which compresses roughly 50% better than even H.264, so matching the same picture in the older FLV codec costs substantially more bits. Expect the .flv to be noticeably larger than the .hevc it came from. To claw back size, lower the "Preset" or set a "Specific file size" — at the cost of some quality — or skip FLV entirely with HEVC to MP4 if you do not specifically need a Flash file.

Is FLV still worth using, given Flash is gone?

For almost everyone, no. Adobe ended Flash Player support on December 31, 2020 and began blocking Flash content on January 12, 2021, and modern browsers no longer play Flash natively. The only honest reason to output .flv today is a legacy Flash-era pipeline — an old RTMP streaming server, a content management system, or a player that was built around the format and still expects that extension. If you just want a clip that plays widely and stays efficient, use HEVC to MP4 instead: MP4 wraps the H.265 family properly and plays on phones, browsers, and most software, where FLV needs a player that predates the Flash shutdown.

My player won't even open the raw .hevc source — is the file broken?

Probably not. A raw H.265 elementary stream has no container and no seek index, so many media players reject it on open even though the data is fine. The converter reads the stream regardless, so the upload and conversion still work even if your local player cannot preview the source. If you want a .hevc that opens in ordinary players, wrap it in a modern container with HEVC to MP4 or HEVC to MKV rather than dropping to FLV.

How are my files handled, and how long are they kept?

In our testing, re-encoding a short raw H.265 stream to the default FLV codec produced a noticeably larger, silent file than the source — the expected cost of a video-only input and an older codec. Your file is uploaded over an encrypted connection, decoded and re-encoded into FLV on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.